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Automatic Quality Checks (QC)

Automatic Quality Checks (QC)

Solar in-situ measurements (GHI, DHI and DNI) that are provided in the Web application have passed an automatic quality check (CQ) procedure. From initial raw in-situ measurements the QC procedure provide 3 type of time-series levels that are described below. Those QC procedures come from previous achievements from the EC funded project ENDORSE and are more detailed in this deliverable: D3.2 "Report on the harmonization and qualification of meteorological data" (PART B: QUALITY CHECK PROCEDURES (WP-3001-3) 43).

QC1

QC1-Completed

QC-Full

Level QC1

Negative pyranometric measurement during night (SZA>93) set to 0

QC Extremely Rare Limits (ERL): values outside ERL set to NaN

QC-ERL

-2< GHI < 1.2 I0 cos(SZA)1.2 + 50

0.1 % of the data (during day)

0 < DNI < 0.95 I0 cos(SZA)0.2 + 10

0.1 % of the data (during day)

-2 < DHI < 0.75 I0 cos(SZA)1.2 + 30

2.5 % of the data (during day)

Level QC1-Completed

Negative pyranometric measurement during night (SZA>93) set to 0

QC Extremely Rare Limits (ERL)

Exclusion of values outside the ERL

Completion of these values (linear interpolation of clear-sky index, limited to 3-h gaps)

From QC1

With completion of these values (linear interpolation of clear-sky index, limited to 3-h gaps)

Level QC-Full

From QC1

QC Consistency Test - 2 components (T2C): 0.1 % rejected

AND QC Consistency Test - 3 components (T3C): 1.1 % rejected

AND rejection of GHI, DHI and DNI measurements for which these QCs cannot be conducted